Re: Change wireless interface "sens" value how?

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On Sat, Feb 12, 2011 at 6:09 PM, JD <[email protected]> wrote:
> On 02/12/2011 07:48 AM, mike cloaked wrote:
>> On Sat, Feb 12, 2011 at 3:30 PM, mike cloaked<[email protected]>  wrote:
>>
>>> I tested a different laptop with different wireless card:
>>>
>>> 03:03.0 Network controller: Intel Corporation PRO/Wireless 2200BG
>>> [Calexico2] Network Connection (rev 05)
>>>
>>> [[email protected] ~]# lsmod|grep ipw
>>> ipw2200               116546  0
>>> libipw                 21037  1 ipw2200
>>> cfg80211              110951  2 ipw2200,libipw
>>> lib80211                4107  3 lib80211_crypt_ccmp,ipw2200,libipw
>>>
>>> For that laptop I can change the value of sens!
>>>
>> This driver seems to refuse sens values in dBm - but only as positive
>> numbers - so I am unsure what the appropriate value is in this case -
>> but it seems that if the wireless driver is able to change the sens
>> value and it can be set in dBm then your advice is good - however I
>> did not realise there was so much variation in support on the driver
>> side and this whole issue is a lot more complicated than I first
>> realised!
>>
> I am also plagued by the same problem for rt2xxx driver.
> So I opened a bug:
> https://bugzilla.kernel.org/show_bug.cgi?id=28972
> You might want to add your comment to this bug and report
> your device and loaded wireless drivers.

I am unsure if the responsibility for drivers is directly kernel?  Or
is there an upstream driver devel list for each of the drivers
separately? For example in my case the ath5k driver does not support
the sens parameter but the ipw2200 driver on another laptop I use does
support it but not measured in dBm but a positive integer - so it is
quite hard to know what those numbers mean in terms of the signal
level. It seems that there is wide variation in the way the drivers
were written and minimal documentation about this in an easy to access
form. Certainly you seem to have to chase up info and spend time doing
the research!

I have been getting help from the networkmanager upstream list but in
the end it looks like it is necessary to get onto whichever upstream
list corresponds to the driver for your hardware - and I have a
collection of different chipsets all having different drivers
(ipw2200, iwl3945, iwl4965, ath5k, rtl8712 which is also supported by
8912 etc)

So I think I will have to do some looking up on which the relevant
upstream list should be in each case - I guess in your case it will be
the list for the Realtek driver which is of course not full gpl! There
is an 8912 driver which is in the kmod staging tree but is not in the
mainstream kernel - though can be loaded via rpmfusion - not sure if
this will drive your device though?

Certainly there is lots to learn for sure!
-- 
mike c
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